1 files changed, 386 insertions, 0 deletions
diff --git a/third_party/nix/src/libmain/shared.cc b/third_party/nix/src/libmain/shared.cc
new file mode 100644
index 0000000000..331ea6b3a9
--- /dev/null
+++ b/third_party/nix/src/libmain/shared.cc
@@ -0,0 +1,386 @@
+#include "libmain/shared.hh"
+
+#include <algorithm>
+#include <cctype>
+#include <csignal>
+#include <cstdlib>
+#include <exception>
+#include <iostream>
+#include <mutex>
+#include <utility>
+
+#include <glog/logging.h>
+#include <openssl/crypto.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include "libstore/globals.hh"
+#include "libstore/store-api.hh"
+#include "libutil/util.hh"
+
+namespace nix {
+
+static bool gcWarning = true;
+
+void printGCWarning() {
+  if (!gcWarning) {
+    return;
+  }
+
+  static bool haveWarned = false;
+  if (!haveWarned) {
+    haveWarned = true;
+    LOG(WARNING) << "you did not specify '--add-root'; "
+                 << "the result might be removed by the garbage collector";
+  }
+}
+
+void printMissing(const ref<Store>& store, const PathSet& paths) {
+  unsigned long long downloadSize;
+  unsigned long long narSize;
+  PathSet willBuild;
+  PathSet willSubstitute;
+  PathSet unknown;
+  store->queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize,
+                      narSize);
+  printMissing(store, willBuild, willSubstitute, unknown, downloadSize,
+               narSize);
+}
+
+void printMissing(const ref<Store>& store, const PathSet& willBuild,
+                  const PathSet& willSubstitute, const PathSet& unknown,
+                  unsigned long long downloadSize, unsigned long long narSize) {
+  if (!willBuild.empty()) {
+    LOG(INFO) << "these derivations will be built:";
+    Paths sorted = store->topoSortPaths(willBuild);
+    reverse(sorted.begin(), sorted.end());
+    for (auto& i : sorted) {
+      LOG(INFO) << "  " << i;
+    }
+  }
+
+  if (!willSubstitute.empty()) {
+    LOG(INFO) << "these paths will be fetched ("
+              << (downloadSize / (1024.0 * 1024.0)) << " MiB download, "
+              << (narSize / (1024.0 * 1024.0)) << "MiB unpacked):";
+
+    for (auto& i : willSubstitute) {
+      LOG(INFO) << i;
+    }
+  }
+
+  if (!unknown.empty()) {
+    LOG(INFO) << "don't know how to build these paths"
+              << (settings.readOnlyMode
+                      ? " (may be caused by read-only store access)"
+                      : "")
+              << ":";
+
+    for (auto& i : unknown) {
+      LOG(INFO) << i;
+    }
+  }
+}
+
+std::string getArg(const std::string& opt, Strings::iterator& i,
+                   const Strings::iterator& end) {
+  ++i;
+  if (i == end) {
+    throw UsageError(format("'%1%' requires an argument") % opt);
+  }
+
+  return *i;
+}
+
+#if OPENSSL_VERSION_NUMBER < 0x10101000L
+/* OpenSSL is not thread-safe by default - it will randomly crash
+   unless the user supplies a mutex locking function. So let's do
+   that. */
+static std::vector<std::mutex> opensslLocks;
+
+static void opensslLockCallback(int mode, int type, const char* file,
+                                int line) {
+  if (mode & CRYPTO_LOCK)
+    opensslLocks[type].lock();
+  else
+    opensslLocks[type].unlock();
+}
+#endif
+
+static void sigHandler(int signo) {}
+
+void initNix() {
+  /* Turn on buffering for cerr. */
+#if HAVE_PUBSETBUF
+  static char buf[1024];
+  std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
+#endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10101000L
+  /* Initialise OpenSSL locking. */
+  opensslLocks = std::vector<std::mutex>(CRYPTO_num_locks());
+  CRYPTO_set_locking_callback(opensslLockCallback);
+#endif
+
+  loadConfFile();
+
+  startSignalHandlerThread();
+
+  /* Reset SIGCHLD to its default. */
+  struct sigaction act;
+  sigemptyset(&act.sa_mask);
+  act.sa_handler = SIG_DFL;
+  act.sa_flags = 0;
+  if (sigaction(SIGCHLD, &act, nullptr) != 0) {
+    throw SysError("resetting SIGCHLD");
+  }
+
+  /* Install a dummy SIGUSR1 handler for use with pthread_kill(). */
+  act.sa_handler = sigHandler;
+  if (sigaction(SIGUSR1, &act, nullptr) != 0) {
+    throw SysError("handling SIGUSR1");
+  }
+
+  /* Register a SIGSEGV handler to detect stack overflows. */
+  detectStackOverflow();
+
+  /* There is no privacy in the Nix system ;-)  At least not for
+     now.  In particular, store objects should be readable by
+     everybody. */
+  umask(0022);
+
+  /* Initialise the PRNG. */
+  struct timeval tv;
+  gettimeofday(&tv, nullptr);
+  srandom(tv.tv_usec);
+}
+
+LegacyArgs::LegacyArgs(
+    const std::string& programName,
+    std::function<bool(Strings::iterator& arg, const Strings::iterator& end)>
+        parseArg)
+    : MixCommonArgs(programName), parseArg(std::move(parseArg)) {
+  mkFlag()
+      .longName("no-build-output")
+      .shortName('Q')
+      .description("do not show build output")
+      .set(&settings.verboseBuild, false);
+
+  mkFlag()
+      .longName("keep-failed")
+      .shortName('K')
+      .description("keep temporary directories of failed builds")
+      .set(&(bool&)settings.keepFailed, true);
+
+  mkFlag()
+      .longName("keep-going")
+      .shortName('k')
+      .description("keep going after a build fails")
+      .set(&(bool&)settings.keepGoing, true);
+
+  mkFlag()
+      .longName("fallback")
+      .description("build from source if substitution fails")
+      .set(&(bool&)settings.tryFallback, true);
+
+  auto intSettingAlias = [&](char shortName, const std::string& longName,
+                             const std::string& description,
+                             const std::string& dest) {
+    mkFlag<unsigned int>(shortName, longName, description, [=](unsigned int n) {
+      settings.set(dest, std::to_string(n));
+    });
+  };
+
+  intSettingAlias(0, "cores",
+                  "maximum number of CPU cores to use inside a build", "cores");
+  intSettingAlias(0, "max-silent-time",
+                  "number of seconds of silence before a build is killed",
+                  "max-silent-time");
+  intSettingAlias(0, "timeout", "number of seconds before a build is killed",
+                  "timeout");
+
+  mkFlag(0, "readonly-mode", "do not write to the Nix store",
+         &settings.readOnlyMode);
+
+  mkFlag(0, "no-gc-warning", "disable warning about not using '--add-root'",
+         &gcWarning, false);
+
+  mkFlag()
+      .longName("store")
+      .label("store-uri")
+      .description("URI of the Nix store to use")
+      .dest(&(std::string&)settings.storeUri);
+}
+
+bool LegacyArgs::processFlag(Strings::iterator& pos, Strings::iterator end) {
+  if (MixCommonArgs::processFlag(pos, end)) {
+    return true;
+  }
+  bool res = parseArg(pos, end);
+  if (res) {
+    ++pos;
+  }
+  return res;
+}
+
+bool LegacyArgs::processArgs(const Strings& args, bool finish) {
+  if (args.empty()) {
+    return true;
+  }
+  assert(args.size() == 1);
+  Strings ss(args);
+  auto pos = ss.begin();
+  if (!parseArg(pos, ss.end())) {
+    throw UsageError(format("unexpected argument '%1%'") % args.front());
+  }
+  return true;
+}
+
+void parseCmdLine(
+    int argc, char** argv,
+    std::function<bool(Strings::iterator& arg, const Strings::iterator& end)>
+        parseArg) {
+  parseCmdLine(baseNameOf(argv[0]), argvToStrings(argc, argv),
+               std::move(parseArg));
+}
+
+void parseCmdLine(
+    const std::string& programName, const Strings& args,
+    std::function<bool(Strings::iterator& arg, const Strings::iterator& end)>
+        parseArg) {
+  LegacyArgs(programName, std::move(parseArg)).parseCmdline(args);
+}
+
+void printVersion(const std::string& programName) {
+  std::cout << format("%1% (Tvix) %2%") % programName % nixVersion << std::endl;
+
+  // TODO(tazjin): figure out what the fuck this is
+  /*if (verbosity > lvlInfo) {
+    Strings cfg;
+#if HAVE_BOEHMGC
+    cfg.push_back("gc");
+#endif
+#if HAVE_SODIUM
+    cfg.push_back("signed-caches");
+#endif
+    std::cout << "Features: " << concatStringsSep(", ", cfg) << "\n";
+    std::cout << "Configuration file: " << settings.nixConfDir + "/nix.conf"
+              << "\n";
+    std::cout << "Store directory: " << settings.nixStore << "\n";
+    std::cout << "State directory: " << settings.nixStateDir << "\n";
+    } */
+  throw Exit();
+}
+
+void showManPage(const std::string& name) {
+  restoreSignals();
+  setenv("MANPATH", settings.nixManDir.c_str(), 1);
+  execlp("man", "man", name.c_str(), nullptr);
+  throw SysError(format("command 'man %1%' failed") % name.c_str());
+}
+
+int handleExceptions(const std::string& programName,
+                     const std::function<void()>& fun) {
+  ReceiveInterrupts receiveInterrupts;  // FIXME: need better place for this
+
+  std::string error = ANSI_RED "error:" ANSI_NORMAL " ";
+  try {
+    try {
+      fun();
+    } catch (...) {
+      /* Subtle: we have to make sure that any `interrupted'
+         condition is discharged before we reach printMsg()
+         below, since otherwise it will throw an (uncaught)
+         exception. */
+      setInterruptThrown();
+      throw;
+    }
+  } catch (Exit& e) {
+    return e.status;
+  } catch (UsageError& e) {
+    LOG(INFO) << e.what();
+    LOG(INFO) << "Try '" << programName << " --help' for more information.";
+    return 1;
+  } catch (BaseError& e) {
+    LOG(ERROR) << error << (settings.showTrace ? e.prefix() : "") << e.msg();
+    if (!e.prefix().empty() && !settings.showTrace) {
+      LOG(INFO) << "(use '--show-trace' to show detailed location information)";
+    }
+    return static_cast<int>(e.status);
+  } catch (std::bad_alloc& e) {
+    LOG(ERROR) << error << "failed to allocate: " << e.what();
+    return 1;
+  } catch (std::exception& e) {
+    LOG(ERROR) << error << e.what();
+    return 1;
+  }
+
+  return 0;
+}
+
+RunPager::RunPager() {
+  if (isatty(STDOUT_FILENO) == 0) {
+    return;
+  }
+  char* pager = getenv("NIX_PAGER");
+  if (pager == nullptr) {
+    pager = getenv("PAGER");
+  }
+  if (pager && (std::string(pager) == "" || std::string(pager) == "cat")) {
+    return;
+  }
+
+  Pipe toPager;
+  toPager.create();
+
+  pid = startProcess([&]() {
+    if (dup2(toPager.readSide.get(), STDIN_FILENO) == -1) {
+      throw SysError("dupping stdin");
+    }
+    if (getenv("LESS") == nullptr) {
+      setenv("LESS", "FRSXMK", 1);
+    }
+    restoreSignals();
+    if (pager != nullptr) {
+      execl("/bin/sh", "sh", "-c", pager, nullptr);
+    }
+    execlp("pager", "pager", nullptr);
+    execlp("less", "less", nullptr);
+    execlp("more", "more", nullptr);
+    throw SysError(format("executing '%1%'") % pager);
+  });
+
+  pid.setKillSignal(SIGINT);
+
+  if (dup2(toPager.writeSide.get(), STDOUT_FILENO) == -1) {
+    throw SysError("dupping stdout");
+  }
+}
+
+RunPager::~RunPager() {
+  try {
+    if (pid != Pid(-1)) {
+      std::cout.flush();
+      close(STDOUT_FILENO);
+      pid.wait();
+    }
+  } catch (...) {
+    ignoreException();
+  }
+}
+
+std::string showBytes(unsigned long long bytes) {
+  return (format("%.2f MiB") % (bytes / (1024.0 * 1024.0))).str();
+}
+
+PrintFreed::~PrintFreed() {
+  if (show) {
+    std::cout << format("%1% store paths deleted, %2% freed\n") %
+                     results.paths.size() % showBytes(results.bytesFreed);
+  }
+}
+
+Exit::~Exit() = default;
+
+}  // namespace nix